Compilare: user.cpp: In function ‘int main()’: user.cpp:43:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&m,&x); ^ user.cpp:47:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&v[i].a,&v[i].b); ^ user.cpp: In function ‘int find(int)’: user.cpp:21:13: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(p+i<=m && v[p+i].a<x) ^ user.cpp: In function ‘int main()’: user.cpp:21:13: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:18:9: note: ‘i’ was declared here int i; ^